CN206874329U - Valve travel prolongation mechanism and l-head engine - Google Patents
Valve travel prolongation mechanism and l-head engine Download PDFInfo
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- CN206874329U CN206874329U CN201720806455.1U CN201720806455U CN206874329U CN 206874329 U CN206874329 U CN 206874329U CN 201720806455 U CN201720806455 U CN 201720806455U CN 206874329 U CN206874329 U CN 206874329U
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Abstract
The utility model discloses a kind of valve travel prolongation mechanism suitable for l-head engine, including fore-set, increasing journey rocking arm, rocker arm shaft, valve spring, spring top race, valve and valve guide bushing；Fore-set is arranged in engine crankcase, increase journey one end to be rotatably connected with rocker arm shaft, valve one end is with increasing journey rocking arm terminal drive connection, and the application point of fore-set, which is arranged on, to be increased on journey rocking arm, and the distance of fore-set application point to rocker arm shaft is less than the distance for increasing journey rocking arm terminal to the rocker arm shaft；Another end points of valve is positioned at increasing journey rocking arm on the circumference that rocker arm shaft rotates；The utility model can improve the lift of nearly exhaust valve, increase intake and exhaust efficiency, eliminate nearly exhaust valve mechanism gap, reduce valve actuating mechanism noise, mitigate valve actuating mechanism weight and reduce inertia and mechanical power loss；Engine overall width can be substantially reduced, and can reduce the windward area of aircraft or engine, further reduce aerodynamic drag in-flight, and the design of aircraft width is more flexible.
Description
Technical field
A kind of piston aviation engine technical field is the utility model is related to, is related to one kind and is applied to side air valve engine
Valve travel prolongation mechanism and l-head engine.
Background technology
In the prior art, it is as follows directly to drive shortcoming present in the four-stroke piston aero-engine of propeller for the slow-speed of revolution：
1st, the four-stroke piston engine of propeller is directly driven because airscrew diameter limits rotating speed all than relatively low, maximum (top) speed
At less than 3000 turns per minute, the engine structure of overhead valve is complicated, and overhead valve hair can not be played in the range of speeds
Motivation is adapted to improve rotating speed to obtain more powerful advantage, and cylinder cap is because having nearly exhaust valve, rocking arm, camshaft and sealing grease chamber
In the presence of so ensureing the bad flexible arrangement of spark plug of the dual ignition of security, because to arrange multiple parts, so hole on cylinder cap
Compare more, loose structure causes bulk strength to decline, and is forced to increase cylinder head material wall thickness and size, engine overall dimensions are huge
Greatly, weight is consequently increased.
2nd, traditional side valve directly drives the four-stroke piston aero-engine of propeller, and the open and close of side valve are by camshaft
Footpath cross fore-set direct drive jack up, use be all manual setting valve clearance fore-set, because gap presence thus noise compared with
The shortcomings of frequency of maintenance is high greatly, is limited, lift is all smaller, and intake and exhaust efficiency is necessarily restricted, this by cam profile
Under the premise of, it must suitably increase valve diameter to increase intake and exhaust efficiency, this causes cylinder head volume and weight to become big again, tradition
The valve and cylinder center of side air valve engine arrange that locating and machining difficulty is big at a certain angle, need to separate repeatedly with difference
Fixture clamping positions to provide different angle, and procedure of processing is cumbersome, ensures to force cost to be substantially increased while machining accuracy.
The content of the invention
In view of the above-mentioned problems, the utility model provides a kind of liter that nearly exhaust valve is improved on the premise of not increasing valve diameter
Journey, increase intake and exhaust efficiency are applied to the valve travel prolongation mechanism and l-head engine of side air valve engine.
To reach above-mentioned purpose, a kind of valve travel prolongation mechanism suitable for l-head engine, including fore-set, increasing are invented
Journey rocking arm, rocker arm shaft, valve spring, the spring seat of honour, valve and valve guide bushing；
The fore-set is arranged in engine crankcase, and the increasing journey one end is rotatably connected with the rocker arm shaft, institute
State valve one end and be located in increasing journey rocking arm terminal drive connection, the valve in valve guide bushing, the valve spring is arranged on
Between valve guide bushing and spring top race, the spring top race is fixed and is set in the valve other end, the application point of the fore-set
It is arranged on the increasing journey rocking arm, the distance of the fore-set application point to rocker arm shaft is less than the increasing journey rocking arm terminal and shaken described in
The distance of arm axle；The end points of the other end of the valve is positioned at the increasing journey rocking arm on the circumference that rocker arm shaft rotates；
When the fore-set rises, fore-set, which acts on, to be increased on journey rocking arm, and the increasing journey rocking arm rotates around the rocker arm shaft, institute
State to increase journey rocking arm and rotate to an angle to drive with the valve end thereof contacts and valve top race and compress the valve spring, drive
The valve of engine slides in valve guide bushing；
When the fore-set resets, the valve spring recovers former long, and spring top race drives the valve to be led in valve
In-pipe, the valve of engine, which sets back, to be put, so that the increasing journey rocking arm is rotated to original position around the rocker arm shaft.
Preferably, the fore-set that the fore-set is roof jack or the fore-set is adjustable length.
To reach above-mentioned purpose, a kind of l-head engine of the utility model, including cylinder main body and nearly exhaust valve；Institute
State nearly exhaust valve and be set in parallel in the cylinder main body side；
The nearly exhaust valve includes valve travel prolongation mechanism and valve, the valve travel prolongation mechanism include fore-set, increasing journey rocking arm,
Rocker arm shaft, valve spring, spring top race, valve and valve guide bushing, the fore-set are slidably arranged in bent axle box main body；
The increasing journey one end is rotatably connected with the rocker arm shaft, and described valve one end connects with increasing the driving of journey rocking arm terminal
Connect, the valve spring is arranged between valve guide bushing and spring top race, and the spring top race is fixedly connected with valve, institute
The application point for stating fore-set is arranged on the increasing journey rocking arm, and the distance of the fore-set application point to rocker arm shaft is less than the increasing journey and shaken
Distance of the arm terminal to the rocker arm shaft；The circumference that another end points of the valve rotates positioned at the increasing journey rocking arm around rocker arm shaft
On line；
When the fore-set rises, fore-set, which acts on, to be increased on journey rocking arm, and the increasing journey rocking arm rotates around the rocker arm shaft, institute
State to increase journey rocking arm and rotate to an angle to drive with the valve end thereof contacts and valve top race and compress the valve spring, drive
The valve of engine slides in valve guide bushing；
When the fore-set resets, the valve spring recovers former long, and spring top race drives the valve to be led in valve
In-pipe, the valve of engine, which sets back, to be put, so that the increasing journey rocking arm is rotated to original position around the rocker arm shaft.
Preferably, the cylinder main body includes cylinder, cylinder head, spark plug, piston, connecting rod, bent axle, crankcase, timing
Gear and camshaft；The cylinder head is tightly connected with the cylinder Single port, and the spark plug is arranged on and the cylinder
In the cylinder head of corresponding setting, the piston, which slides, to be set in the cylinder, the piston away from described spark plug one end with
The link transmission connection, the connecting rod are rotatably connected with described bent axle one end, and bent axle is arranged in crankcase through bearing shell slide fit,
The bent axle other end is connected with the little gear coaxial transmission of the timing gears, and the camshaft slide fit is arranged on crankcase
In watt groove, the gear wheel of the timing gears is connected with the camshaft drive；Guide hole, the top are provided with the crankcase
Post is located in the guide hole, and the fore-set other end is located in the cam rotation contour of the camshaft；
When the spark-discharge lights gaseous mixture, the piston promotes the link motion, drives the bent axle to revolve
Turn, so as to drive the pinion rotation of the timing gears, little gear drives the gear wheel of timing gears, and bull gear drive drives
The cam axle, the fore-set is promoted to rise during cam rotation on the camshaft, the fore-set, which acts on, to be increased journey and shake
On arm, the increasing journey rocking arm rotates around the rocker arm shaft, and the increasing journey rocking arm rotates to an angle and the valve end thereof contacts
Drive valve spring upper seat circle and compress the valve spring, drive the valve of engine to be slided in valve guide bushing；
When the piston reciprocating displacement is dynamic, the bent axle, timing gears and camshaft rotate under inertia force effect,
The fore-set resets, and the valve spring is recovered former long slide the spring top race and valve in valve guide bushing and pushed back to
Original position, the increasing journey rocking arm are rotated to original position around the rocker arm shaft.
Preferably, the fore-set that the column is roof jack or the fore-set is adjustable length.
Preferably, the valve center line and cylinder center be arranged in parallel.
Preferably, the crankshaft output end is connected with propeller.
The utility model can improve the lift of nearly exhaust valve, increase intake and exhaust effect on the premise of valve diameter is not increased
Rate, engine power is improved, reduce valve actuating mechanism noise, mitigated valve actuating mechanism weight and reduce inertia and mechanical power loss, reduce
Engine volume, reduce difficulty of processing and cost.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model valve travel prolongation mechanism and l-head engine；
Fig. 2 is the utility model l-head engine cross-sectional view；
1 is spark plug in figure, and 2 be cylinder head, and 3 be cylinder, and 4 be piston, and 5 be connecting rod, and 6 be bent axle, and 7 be crankcase, and 8 are
Timing gears, 9 be camshaft, and 10 be fore-set, and 11 is increase journey rocking arm, and 12 be rocker arm shaft, and 13 be spring top race, and 14 be valve bullet
Spring, 15 be valve guide bushing, and 16 be valve.
Embodiment
The utility model is further described with reference to Figure of description.
Embodiment 1
As shown in figure 1, a kind of valve travel prolongation mechanism suitable for l-head engine of the present embodiment, including fore-set 10,
Increase journey rocking arm 11, rocker arm shaft 12, valve spring 14, spring top race 13, valve 16, valve guide bushing 15；
The fore-set 10 is arranged in engine crankcase, and described one end of increasing journey rocking arm 11 connects with the rocker arm shaft 12 rotation
Connect, described one end of valve 16 is located in valve guide bushing 15 with increasing the terminal drive connection of journey rocking arm 11, the valve 16, the gas
Door spring 14 is arranged between valve guide bushing 15 and spring top race 13, and it is another that the fixation of spring top race 13 is set in valve 16
One end, the application point of the fore-set 10 are arranged on the increasing journey rocking arm 11, the application point of fore-set 10 to rocker arm shaft 12 away from
With a distance from less than the terminal of increasing journey rocking arm 11 to the rocker arm shaft 12；The end points of the other end of the valve 16 is positioned at described
Increase journey rocking arm 11 on the circumference that rocker arm shaft 12 rotates；
When the fore-set 10 rises, fore-set 10, which acts on, to be increased on journey rocking arm 11, and the increasing journey rocking arm 11 is around the rocking arm
Axle 12 rotates, and the increasing journey rocking arm 11 rotates to an angle drives the spring top race 13 of valve 16 with the end thereof contacts of valve 16
And the valve spring 14 is compressed, drive the valve 16 of engine to be slided in valve guide bushing 15；
When the fore-set 10 resets, the valve spring 14 recovers former length, and spring top race 13 drives the valve 16
Moved in valve guide bushing 15, the valve 16 of engine, which sets back, to be put, so that the increasing journey rocking arm 11 is around the rocker arm shaft
12 rotate to original position.
The fore-set 10 that the fore-set 10 is roof jack 10 or the fore-set 10 is adjustable length；
Roof jack 10 is used to eliminate valve actuating mechanism noise with the gap of adjust automatically valve actuating mechanism part；
The present embodiment increases journey rocking arm 11 by designing, and increases valve in the case where not increasing the diameter of valve 16 of engine
Lift improves intake and exhaust amount, and valve 16 is small in light weight can further to reduce inertia and mechanical power loss.
Embodiment 2
A kind of as shown in figure 1, l-head engine of the present embodiment, it is characterised in that：Including cylinder main body and nearly exhaust
Door；The nearly exhaust valve is set in parallel in the cylinder main body side；
As shown in Fig. 2 nearly exhaust valve is arranged in parallel in the cylinder main body side of engine, engine whole width size and
Volume can be substantially reduced, and weight is lighter, can reduce the windward area of aircraft or engine, further reduce gas in-flight
Dynamic resistance, the design of aircraft width are more flexible；
The nearly exhaust valve includes valve travel prolongation mechanism and valve 16, and the valve travel prolongation mechanism includes fore-set 10, increases journey
Rocking arm 11, rocker arm shaft 12, valve spring 14, spring top race 13, valve 16 and valve guide bushing 15, the fore-set 10 are slided and set
Put in bent axle box main body；
Described one end of increasing journey rocking arm 11 is rotatably connected with the rocker arm shaft 12, and the valve 16 is located in valve guide bushing 15
Interior, the valve spring 14 is arranged between valve guide bushing 15 and spring top race 13, and the spring top race 13 is fixed and is arranged
It is arranged in valve 16 close to the one end of journey rocking arm 11, the application point of the fore-set 10 is increased on the increasing journey rocking arm 11, the fore-set
The distance of 10 application points to rocker arm shaft 12 is less than the terminal of increasing journey rocking arm 11 to the distance of the rocker arm shaft 12；The valve 16
End point positioned at the increasing journey rocking arm 11 on the circumference that rocker arm shaft 12 rotates, the end points of valve 16 is with increasing journey rocking arm 11
Terminal drive connection；
When the fore-set 10 rises, fore-set 10, which acts on, to be increased on journey rocking arm 11, and the increasing journey rocking arm 11 is around the rocking arm
Axle 12 rotates, and the increasing journey rocking arm 11 rotates to an angle drives the spring top race 13 of valve 16 with the end thereof contacts of valve 16
And the valve spring 14 is compressed, drive the valve 16 of engine to be slided in valve guide bushing 15；
When the fore-set 10 resets, the valve spring 14 recovers former length, and spring top race drives the valve 16 to exist
Moved in valve guide bushing 15, the valve 16 of engine, which sets back, to be put, so that the increasing journey rocking arm 11 is around the rocker arm shaft 12
Rotate to original position.
The present embodiment can improve the lift of nearly exhaust valve on the premise of valve diameter is not increased, and increase intake and exhaust efficiency,
Engine power is improved, reduces valve actuating mechanism noise, mitigates valve actuating mechanism weight reduction inertia and mechanical power loss, diminution is started
Body accumulates, and reduces difficulty of processing and cost.
Embodiment 3
Based on embodiment 2, cylinder main body described in the present embodiment includes cylinder 3, cylinder head 2, spark plug 1, piston 4, connecting rod
5th, bent axle 6, crankcase 7, timing gears 8 and camshaft 9；The cylinder head 2 is tightly connected with the Single port of cylinder 3, institute
Spark plug 1 is stated to be arranged on and in the cylinder head 2 of the 3 corresponding setting of cylinder, the piston 4 slides sets in the cylinder 3,
The piston 4 is connected away from described one end of spark plug 1 and the connecting rod 5, and the connecting rod 5 rotates with described one end of bent axle 6
Connection, bent axle 6 are arranged in crankcase 7 through bearing shell slide fit, and the little gear of the other end of bent axle 6 and timing gears 8 coaxially passes
Dynamic connection, the slide fit of camshaft 9 are arranged in watt groove of crankcase 7, and the gear wheel of timing gears 8 passes with the camshaft 9
Dynamic connection；Guide hole is provided with the crankcase 7, the fore-set 10 is located in the guide hole, the other end position of fore-set 10
In in the cam rotation contour of the camshaft 9；
When gaseous mixture is lighted in the spark plug 1 electric discharge, the piston 4 promotes the connecting rod 5 to move, and drives the bent axle
6 rotations, so as to drive the pinion rotation of the timing gears 8, little gear drives the gear wheel of timing gears 8,8 turns of gear wheel
It is dynamic to drive the camshaft 9 to rotate, promote the column 10 to rise during cam rotation on the camshaft 9, the fore-set 10
Act on and increase on journey rocking arm 11, the increasing journey rocking arm 11 rotates around the rocker arm shaft 12, and the increasing journey rocking arm 11 rotates certain angle
Degree drives the spring top race 13 of valve 16 with the end thereof contacts of valve 16 and compresses the valve spring 14, drives engine
Valve 16 slides in valve guide bushing 15；
When the shift reciprocately of piston 4 is dynamic, the bent axle 6, timing gears 8 and camshaft 9 are under inertia force effect
Rotate, the fore-set 10 resets, and the valve spring 14 recovers former length and leads the spring top race 13 and valve 16 in valve
Slided in pipe 15 and push back to original position, the increasing journey rocking arm 11 is rotated to original position around the rocker arm shaft 12.
The present embodiment increases journey rocking arm 11 under the rotation interaction of the reaction force and camshaft 9 of valve spring 14 and realized
Periodically swing back and forth, during being centre swinging with rocker arm shaft 12, the radial location from the center of circle distal end of rocker arm shaft 12 is passed through
Distance, close to the center of circle of rocker arm shaft 12 radial location pass through distance it is short, the application point of fore-set 10 is relatively close to rocker arm shaft
12 centers of circle one end, the purpose of increase valve stroke is realized by the gap of application point；Valve is driven indirectly by increasing journey rocking arm 11
16 design can increase by more than 50% valve stroke than traditional valve-on-the-side aero-engine.
Embodiment 4
Based on embodiment 3, column 10 described in the present embodiment is roof jack or the fore-set 10 is adjustable length
Fore-set；
The present embodiment uses roof jack or the fore-set can be with adjust automatically gazogene for the fore-set of adjustable length
The gap of structure part, eliminate valve actuating mechanism noise；
One of which preferred embodiment, the center line of valve 16 and cylinder 3 centerline parallel are set；
The center line of the present embodiment valve 16 and the center line of cylinder 3 are substantially parallel, can be in being once loaded during processing and manufacturing
Cylinder body and the finishing step of valve guide bushing 15 and valve retainer are completed, reduces and is loaded number and manufacturing cost improves entirety
Precision；
One of which preferred embodiment, the output end of bent axle 6 are connected with propeller；
The propeller of the present embodiment rotation can serve as flywheel energy storage effect, it is not necessary to flywheel mechanism is separately configured, enters one
Step alleviates main screw lift, while the more fuel-efficient environmental protection of idling speed that can reduce engine.
More than, preferred embodiment only of the present utility model, but the scope of protection of the utility model is not limited thereto, and is appointed
What those familiar with the art the change that can readily occur in or replaces in the technical scope that the utility model discloses
Change, should all cover within the scope of protection of the utility model.Therefore, the scope of protection of the utility model should be with claim
The protection domain defined is defined.
Claims (7)
- A kind of 1. valve travel prolongation mechanism suitable for l-head engine, it is characterised in that：Including fore-set, increasing journey rocking arm, shake Arm axle, valve spring, spring top race, valve and valve guide bushing；The fore-set is arranged in engine crankcase, and the increasing journey one end is rotatably connected with the rocker arm shaft, the gas Door one end is located in valve guide bushing with increasing journey rocking arm terminal drive connection, the valve, and the valve spring is arranged on valve Between conduit and spring top race, the spring top race, which is fixed, is set in the valve other end, and the application point of the fore-set is set On the increasing journey rocking arm, the distance of the fore-set application point to rocker arm shaft is less than the increasing journey rocking arm terminal to the rocker arm shaft Distance；The end points of the other end of the valve is positioned at the increasing journey rocking arm on the circumference that rocker arm shaft rotates；When the fore-set rises, fore-set, which acts on, to be increased on journey rocking arm, and the increasing journey rocking arm rotates around the rocker arm shaft, the increasing Journey rocking arm, which rotates to an angle, to be driven valve spring upper seat circle with the valve end thereof contacts and compresses the valve spring, is driven The valve of engine slides in valve guide bushing；When the fore-set resets, the valve spring recovers former long, and spring top race drives the valve in valve guide bushing Mobile, the valve of engine, which sets back, to be put, so that the increasing journey rocking arm is rotated to original position around the rocker arm shaft.
- A kind of 2. valve travel prolongation mechanism as claimed in claim 1, it is characterised in that：The fore-set is roof jack or described Fore-set is the fore-set of adjustable length.
- A kind of 3. l-head engine, it is characterised in that：Including cylinder main body and nearly exhaust valve；It is described that near exhaust valve is parallel sets Put in the cylinder main body side；The nearly exhaust valve includes valve travel prolongation mechanism and valve, and the valve travel prolongation mechanism includes fore-set, increases journey rocking arm, rocking arm Axle, valve spring, spring top race, valve and valve guide bushing, the fore-set are slidably arranged in bent axle box main body；The increasing journey one end is rotatably connected with the rocker arm shaft, and the valve is located in valve guide bushing, the valve bullet Spring is arranged between valve guide bushing and spring top race, and the spring top race, which is fixed, is set in valve close to increasing journey rocking arm one End, the application point of the fore-set are arranged on the increasing journey rocking arm, and the distance of the fore-set application point to rocker arm shaft is less than described Increase journey rocking arm terminal to the distance of the rocker arm shaft；The end point of the valve rotates positioned at the increasing journey rocking arm around rocker arm shaft On circumference, the valve end points is with increasing journey rocking arm terminal drive connection；When the fore-set rises, fore-set, which acts on, to be increased on journey rocking arm, and the increasing journey rocking arm rotates around the rocker arm shaft, the increasing Journey rocking arm, which rotates to an angle, to be driven valve spring upper seat circle with the valve end thereof contacts and compresses the valve spring, is driven The valve of engine slides in valve guide bushing；When the fore-set resets, the valve spring recovers former long, and spring top race drives the valve in valve guide bushing Mobile, the valve of engine, which sets back, to be put, so that the increasing journey rocking arm is rotated to original position around the rocker arm shaft.
- A kind of 4. l-head engine as claimed in claim 3, it is characterised in that：The cylinder main body includes cylinder, cylinder Lid, spark plug, piston, connecting rod, bent axle, crankcase, timing gears and camshaft；The cylinder head and the cylinder Single port It is tightly connected, the spark plug is arranged in the cylinder head corresponding with the cylinder, and the piston, which slides, sets the cylinder Interior, the piston is connected away from described spark plug one end with the link transmission, the connecting rod and the rod journal one End rotatable connection, bent axle are arranged in crankcase through bearing shell slide fit, the little gear of the bent axle other end and the timing gears Coaxial transmission connect, the camshaft slide fit be arranged on crankcase watt groove in, the gear wheel of the timing gears with it is described convex Wheel shaft is connected；Guide hole is provided with the crankcase, the fore-set is located in the guide hole, the fore-set other end position In in the cam rotation contour of the camshaft；When the spark-discharge lights gaseous mixture, the piston promotes the link motion, drives the bent axle to rotate, from And drive the pinion rotation of the timing gears, little gear drive timing gears gear wheel, bull gear drive drive described in Cam axle, the fore-set is promoted to rise during cam rotation on the camshaft, the fore-set, which acts on, to be increased on journey rocking arm, The increasing journey rocking arm rotates around the rocker arm shaft, and the increasing journey rocking arm rotates to an angle takes offence with the valve end thereof contacts band Door spring top race simultaneously compresses the valve spring, drives the valve of engine to be slided in valve guide bushing；When the piston reciprocating displacement is dynamic, the bent axle, timing gears and camshaft rotate under inertia force effect, described Fore-set resets, and the valve spring recovers former long slide the spring top race and valve in valve guide bushing and pushes back to original position Put, the increasing journey rocking arm is rotated to original position around the rocker arm shaft.
- A kind of 5. l-head engine as claimed in claim 4, it is characterised in that：The fore-set is roof jack or described Fore-set is the fore-set of adjustable length.
- A kind of 6. l-head engine as claimed in claim 3, it is characterised in that：The valve center line and cylinder center It is arranged in parallel.
- A kind of 7. l-head engine as claimed in claim 3, it is characterised in that：The crankshaft output end is connected with spiral shell Revolve oar.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720806455.1U CN206874329U (en) | 2017-07-05 | 2017-07-05 | Valve travel prolongation mechanism and l-head engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720806455.1U CN206874329U (en) | 2017-07-05 | 2017-07-05 | Valve travel prolongation mechanism and l-head engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107152321A (en) * | 2017-07-05 | 2017-09-12 | 冯长捷 | Valve travel prolongation mechanism and l-head engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107152321A (en) * | 2017-07-05 | 2017-09-12 | 冯长捷 | Valve travel prolongation mechanism and l-head engine |
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Effective date of registration: 20180309 Address after: Anhui Wuhu Green Village Economic Development Zone of Wuhu County of Anhui province Wuhu City 241000 factory building 11 Patentee after: Wuhu Long Jie Aviation Power Technology Co., Ltd. Address before: 101399 Korea Town, Beijing, Shunyi District Patentee before: Feng Changjie |